Open up the Macromedia Extension Manager and press the install button.

Then navigate to the file you downloaded

Press Install then Accept the licence agreement.

Then the extension will be installed.

If you had Flash open, restart it now for the extension to take effect.

To use this extension in your Flash documents when using action script 2.0 you just need to add this line once to your actionscript in frame 1.

#include "lmc_tween.as"

If you are using action script 1.0 then you need to use this instead.

#include "lmc_tween_as1.as"

Now on to the tutorial.

First we need to put the object we wish to fade in to the document. This can be made in Flash or you can import it in to the document.

Put the object on to the frame. Then select it and press F8. This will bring up the convert to symbol screen:

Now give it an instance name.

Deselect the object and insert this action script for the frame, make sure the object is not selected.

#include "lmc_tween.as"

image._alpha = 0;

image.tween("_alpha",100,speed,ease_type,1.1);

Now to explain what this code does.

#include "lmc_tween.as"

This includes the extension that we installed earlier.

image._alpha = 0;

This sets the initial alpha transparency for the object, in this case it is completely transparent.

image.tween("_alpha",100,speed,ease_type,1.1);

This makes the object completely opaque. The 100 defines the opacity of the object and the 1.1 defines the amount of time until the tween takes place.

To get better result you may want to set the fps to 30.